TermCymru

Results are displayed in Welsh alphabetical order A-Y
Welsh: sylwebaeth
English: commentary
Status C
Subject: Culture and the arts
Part of speech: Noun, Feminine, Singular
Definition: on a game, race etc.
Last updated: 4 June 2004
Welsh: sylwebu
English: commentate
Status C
Subject: Culture and the arts
Part of speech: Verb
Last updated: 4 June 2004
Welsh: sylwedd
English: substance
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: sylweddau
Definition: Yn gyffredinol ym maes gwyddoniaeth, unrhyw fater sydd â màs ac sy'n cymryd gofod. Yn benodol ym maes cemeg, unrhyw ddeunydd ac iddo gyfansoddiad cemegol penodol.
Notes: Yn ogystal â'r defnydd gwyddonol, gellir defnyddio'r gair 'substance'/'sylwedd' i gyfeirio at bethau fel alcohol a chyffuriau, a gellir ei ddefnyddio i gyfeirio'n drosiadol i sôn am y prif beth y cyfansoddir rhywbeth ohono (ee 'sylwedd y ddadl').
Last updated: 16 September 2024
Welsh: sylwedd anweddol
English: volatile substance
Status C
Subject: Social services
Part of speech: Noun, Masculine, Singular
Last updated: 27 January 2004
Welsh: sylweddau â blaenoriaeth
English: priority substances
Status C
Subject: Environment
Part of speech: Noun, Plural
Last updated: 1 November 2010
Welsh: sylweddau dan reolaeth
English: controlled substances
Status C
Subject: Justice and order
Part of speech: Noun, Plural
Last updated: 1 September 2010
Welsh: sylweddau gwaharddedig
English: prohibited substances
Status C
Subject: Agriculture
Part of speech: Noun, Plural
Last updated: 29 July 2003
Welsh: sylweddau peryglus
English: hazardous substances
Status C
Subject: Waste
Part of speech: Noun, Plural
Last updated: 23 July 2003
Welsh: sylweddau peryglus
English: dangerous substances
Status C
Subject: Health
Part of speech: Noun, Plural
Last updated: 17 May 2011
Welsh: sylweddau peryglus â blaenoriaeth
English: priority hazardous substances
Status C
Subject: Environment
Part of speech: Noun, Plural
Last updated: 1 November 2010
Welsh: sylweddau poly- a perfflworoalcyl
English: poly- and perfluoroalkyl substances
Status B
Subject: Environment
Part of speech: Noun, Plural
Notes: Cemegau â phriodweddau gwrth-staen, gwrth-ddŵr a gwrthsticio sydd yn lygryddion parhaus yn yr amgylchedd.
Last updated: 8 September 2025
Welsh: sylweddau poly- a perfflworoalcyl
English: PFAS
Status B
Subject: Environment
Part of speech: Noun, Plural
Notes: Dyma’r acronym Saesneg a ddefnyddir am poly- and perfluoroalkyl substances, cemegau â phriodweddau gwrth-staen, gwrth-ddŵr a gwrthsticio sydd yn lygryddion parhaus yn yr amgylchedd.
Last updated: 8 September 2025
Welsh: sylwedd a wenwynwyd
English: poisoned substance
Status A
Subject: Agriculture
Part of speech: Noun, Masculine, Singular
Plural: sylweddau a wenwynwyd
Last updated: 21 July 2022
Welsh: sylwedd carsinogenaidd
English: carcinogenic substance
Status C
Subject: Health
Part of speech: Noun, Masculine, Singular
Last updated: 1 September 2010
Welsh: sylwedd cyflasu
English: flavouring substance
Status B
Subject: Food
Part of speech: Noun, Masculine, Singular
Plural: sylweddau cyflasu
Last updated: 17 April 2024
Welsh: sylwedd gelio
English: gelling agent
Status A
Subject: Food
Part of speech: Noun, Masculine, Singular
Last updated: 8 March 2012
Welsh: sylwedd gwella blas
English: flavour enhancer
Status B
Subject: Food
Part of speech: Noun, Masculine, Singular
Last updated: 31 January 2012
Welsh: sylwedd gwella treuliadwyedd
English: digestibility enhancer
Status B
Subject: Agriculture
Part of speech: Noun, Masculine, Singular
Plural: sylweddau gwella treuliadwyedd
Context: Mae’r paratoad a bennir yn y tabl, sy’n perthyn i’r categori ychwanegion “ychwanegion sootechnegol” ac i’r grŵp gweithredol “sylweddau gwella treuliadwyedd”, wedi ei awdurdodi fel ychwanegyn mewn maeth anifeiliaid yn ddarostyngedig i’r amodau a nodir yn y tabl.
Notes: Daw'r testun cyd-destunol o Reoliadau Ychwanegion Bwyd Anifeiliaid (Awdurdodiadau) (Cymru) 2022.
Last updated: 10 December 2024
Welsh: sylwedd gwenwynig
English: poisonous substance
Status A
Subject: Agriculture
Part of speech: Noun, Masculine, Singular
Plural: sylweddau gwenwynig
Last updated: 21 July 2022
Welsh: sylwedd llesgáu
English: stupefeying substance
Status A
Subject: Agriculture
Part of speech: Noun, Masculine, Singular
Plural: sylweddau llesgáu
Definition: Sylwedd a roddir i anifail er mwyn amharu ar lefel ei ymwybyddiaeth a peri iddo golli'r gallu i ymateb i stimwli.
Last updated: 21 July 2022
Welsh: sylwedd llygru
English: polluting substance
Status C
Subject: Environment
Part of speech: Noun, Masculine, Singular
Last updated: 23 September 2004
Welsh: sylwedd meddwol
English: intoxicating substance
Status B
Subject: Health
Part of speech: Noun, Masculine, Singular
Plural: sylweddau meddwol
Definition: Alcohol neu unrhyw sylwedd neu gynnyrch arall all gael ei ddefnyddio i achosi meddwdod (naill ai drwy ei fewnanadlu ef neu ei darth, neu fel arall), ac nad yw'n gyffur rheoledig fel y'i diffiniwyd gan adran 2 o Ddeddf Camddefnyddio Cyffuriau 1971.
Notes: Seiliwyd y diffiniad ar y Cod Dedfrydu.
Last updated: 27 January 2026
Welsh: sylweddol gaeedig
English: substantially enclosed
Status C
Subject: Law
Part of speech: Adjective
Definition: public place
Last updated: 18 July 2006
Welsh: sylwedd perfflworoalcyl
English: perfluoroalkyl substance
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: sylweddau perfflworoalcyl
Last updated: 8 September 2025
Welsh: sylwedd peryglus a darniweidiol
English: hazardous and noxious substance
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: sylweddau peryglus a darniweidiol
Definition: Sylwedd heblaw olew sy’n debygol, os cyflwynir ef i’r amgylchedd forol, o beryglu iechyd dynol, niweidio adnoddau byw a bywyd morol, difrodi amwynderau neu ymyrryd â defnydd cyfreithlon arall o’r môr.
Notes: Yng nghyd-destun y Protocol ar Fod yn Barod am Ddigwyddiadau Llygru gan Sylweddau Peryglus a Darniweidiol, Ymateb Iddynt a Chydweithredu mewn Perthynas â Hwy.
Last updated: 15 June 2023
Welsh: sylwedd polyfflworoalcyl
English: polyfluoroalkyl substance
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: sylweddau polyfflworoalcyl
Last updated: 8 September 2025
Welsh: sylwedd rhestredig
English: listed substance
Status C
Subject: Planning
Part of speech: Noun, Masculine, Singular
Last updated: 2 December 2004
Welsh: Sylwedd sy’n Peri Pryder Mawr Iawn
English: Substances of Very High Concern
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: Sylweddau sy’n Peri Pryder Mawr Iawn
Definition: Categori sy'n pennu bod sylwedd yn dod o fewn cwmpas y ddeddfwriaeth REACH.
Last updated: 27 June 2019
Welsh: sylwedd y gyfundrefn drosiannol
English: phase-in substance
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: sylweddau'r gyfundrefn drosiannol
Notes: Categori o sylweddau a reolir o dan y Rheoliadau REACH. Mae'n bosibl y byddai "un o sylweddau'r gyfundrefn drosiannol" yn gweithio'n well mewn rhai cyd-destunau lle mae angen y ffurf unigol.
Last updated: 1 July 2021
Welsh: sylwedd ymbelydrol
English: radioactive substance
Status B
Subject: Environment
Part of speech: Noun, Masculine, Singular
Plural: sylweddau ymbelydrol
Last updated: 23 March 2021
Welsh: sylwi ac ymateb
English: attend and respond
Status B
Subject: Education
Part of speech: Verb
Definition: Proses ddwyran sy'n sail i ddull cyfathrebu dwyffordd. Arwyddocâd yr elfen ‘sylwi’ yw bod babi neu blentyn bach yn sylwi ar rywbeth neu rywun neu'n cymryd sylw ohono, ee edrych ar wyneb person pan fydd yn siarad. Arwyddocâd ‘ymateb’ yw bod y babi neu'r plentyn bach yn ymateb neu'n cyfathrebu'n ôl mewn rhyw ffordd, ee gwneud cyswllt llygad, gwenu, parablu neu ddynwared geiriau.
Notes: Term a ddefnyddir yn neunyddiau'r cwricwlwm.
Last updated: 20 August 2025
Welsh: Sylw i Gwsmeriaid
English: Customer Focus
Status B
Subject: Personnel
Part of speech: Noun, Masculine, Singular
Last updated: 10 June 2003
Welsh: Sylw yn ôl Symptomau
English: See on Symptom
Status A
Subject: Health
Part of speech: Verb
Definition: Methodoleg glinigol lle trefnir i weld cleifion pan fydd symptomau penodol yn ymddangos, yn hytrach nag ar ddyddiad a bennir ymlaen llaw.
Notes: Defnyddir yr acronym SOS yn y ddwy iaith
Last updated: 16 April 2020
Welsh: symbiosis diwydiannol
English: industrial symbiosis
Status C
Subject: Environment
Part of speech: Noun, Masculine, Singular
Last updated: 30 March 2006
Welsh: symbol arian
English: currency symbol
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: symbol at
English: at-symbol
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: symbolau
English: symbol
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: symbolau amrywiol
English: miscellaneous symbols
Status B
Subject: ICT
Part of speech: Noun, Plural
Last updated: 19 July 2005
Welsh: symbol clwyd
English: hash symbol
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: symbol nodchwiliwr
English: wildcard symbol
Status B
Subject: ICT
Part of speech: Noun, Masculine, Singular
Last updated: 19 July 2005
Welsh: symbylu'r galw
English: stimulation of demand
Status C
Subject: Economic development
Part of speech: Verb
Last updated: 14 June 2004
Welsh: symbylu’r nerf sacrol
English: sacral nerve stimulation
Status C
Subject: Health
Part of speech: Verb
Context: Diolch am eich e-bost pellach ar 28 Awst ar ran eich etholwr yn gofyn am gadarnhad o'r amserlen ar gyfer gweithredu argymhellion y Grŵp Gorchwyl a Gorffen ar Anymataliaeth Ysgarthol, a chanlyniad adolygiad Technoleg Iechyd Cymru o ddefnydd triniaeth Symbylu'r Nerf Sacrol.
Last updated: 26 September 2019
Welsh: Symiau Bach o Gymorth Ariannol
English: Small Amounts of Financial Assistance
Status B
Subject: Finance and statistics
Part of speech: Noun, Plural
Notes: Elfen o gymorth ariannol o dan y Cytundeb Masnach a Chydweithredu rhwng yr UE a’r DU.
Last updated: 21 July 2022
Welsh: Symiau Bach o Gymorth Ariannol
English: SAFA
Status B
Subject: Finance and statistics
Part of speech: Noun, Plural
Notes: Dyma'r acronym Saesneg a ddefnyddir am Small Amounts of Financial Assistance.
Last updated: 21 July 2022
Welsh: symiau canlyniadol
English: consequentials
Status B
Subject: Finance and statistics
Part of speech: Noun, Plural
Last updated: 21 February 2005
Welsh: symiau cynhaliaeth cymudedig
English: commuted maintenance sums
Status C
Subject: Finance and statistics
Part of speech: Noun, Plural
Last updated: 23 February 2024
Welsh: Symiau Dyddiol a Argymhellir
English: Recommended Daily Allowances
Status B
Subject: Food
Part of speech: Noun, Feminine, Plural
Last updated: 8 March 2012
Welsh: symiau/ffigurau cyfanredol
English: aggregate amounts/figures
Status C
Subject: Local government
Part of speech: Noun, Plural
Last updated: 2 November 2010
Welsh: symiau gostyngol
English: discounted amounts
Status C
Subject: Finance and statistics
Part of speech: Noun, Plural
Last updated: 18 January 2007
Welsh: symiau mawr o fwydydd o ansawdd da am bris rhesymol  
English: bulk quality foods
Status C
Subject: Food
Part of speech: Noun, Plural
Last updated: 29 October 2010